摘要
9%-12%Cr马氏体耐热钢凭借其优异的综合性能,广泛应用于超超临界发电厂的主要部件。简要地概述了9%-12%Cr钢在循环载荷作用下的微观损伤机制,将材料微观组织演化过程与统一Chaboche黏塑性模型中内变量的变化相关联,应用Chaboche模型预测9%-12%Cr钢中P91钢,在500℃时不同应变幅值和不同应变速率条件下的循环应力-应变迟滞回线,将预测结果与已报道的试验数据进行比较,结果表明:不同条件下,该模型可以很好地预测P91钢的循环应力-应变迟滞回线,模型中运动硬化变量X描述材料在循环初期的应变强化现象,各向同性硬化变量R主要描述材料软化现象。
9%-12% Cr steel was widely used as the main components in ultra-supercritical power plant due to its good comprehensive mechanical properties. Microstructural damage mechanisms of 9%-12% Cr under cyclic load were explained. The microstructural damage mechanisms was related to internal state variables in Chaboche model,stress-strain hysteresis loops of P91 steel were predicited by unified Chaboche viscoplastic model at 500 ℃ for different strain amplitudes and strain rates,and the simulation results were compared with experimental results. Results showed that the unified Chaboche model could accurately predict the stress-strain hysteresis loops of P91 steel under different conditions,kinematic hardening variables X described the strain hardening at primary stage,while isotropic variable R was the main factor for controlling the softening behavior.
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2014年第6期72-77,共6页
Journal of Nanjing Tech University(Natural Science Edition)
基金
江苏省普通高校研究生科研创新计划(CXZZ13_0430)
关键词
马氏体耐热钢
低周疲劳
Chaboche模型
微观损伤
martensitic heat resistant steel
low cycle fatigue
Chaboche model
microstructural damage
